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On the Ignition Delay of Jojoba Bio-Gasoline Blended with Basic Gasoline as an Octane Booster
ISSN: 1946-3952, e-ISSN: 1946-3960
Published September 17, 2020 by SAE International in United States
Citation: Radwan, M., Abu-Elyazeed, O., Makar, F., and Attai, Y., "On the Ignition Delay of Jojoba Bio-Gasoline Blended with Basic Gasoline as an Octane Booster," SAE Int. J. Fuels Lubr. 13(3):207-222, 2020, https://doi.org/10.4271/04-13-03-0013.
Synthesizing a higher antiknock quality fuel is required to increase the thermal efficiency of spark-ignition engines. Since the octane number (ON) of pure Jojoba Bio-Gasoline (JBG) is significantly in excess of one hundred, it can thus be used as an octane booster. In this work, the influence of blending different percentages of JBG with petroleum gasoline (octane number 80) on the ON was investigated. Then the results of such investigation were employed to produce new gasolines with ONs of 92, 95, and 98. The ignition delays of such new gasolines were measured and compared with those of basic gasolines. In order to perform the experiments, a shock tube was designed, manufactured, and fully instrumented for ignition delay measurements. The test variables included the type of fuel, equivalence ratio (Φ), ignition temperature (Tig), and ignition pressure (Pig). It was found that the new boosted gasolines exhibited higher ignition delays by about 40% compared to that of basic gasolines. Also the ignition delay for the new gasoline could be reduced considerably by increasing the ignition temperatures and pressures. Moreover, empirical correlations were developed, and the calculated data were found to be in good agreement with the experimental data. Arrhenius plots were made and the activation energy of boosted gasoline was found to be higher than that of basic gasoline by 9.1%. The new bio-derived octane-boosted gasoline improves the combustion characteristics when compared to basic gasoline and thus can be used for future high compression ratio/high thermal efficiency engines.